S21800 Stainless Steel vs. C70250 Copper

S21800 stainless steel belongs to the iron alloys classification, while C70250 copper belongs to the copper alloys. There are 20 material properties with values for both materials. Properties with values for just one material (15, in this case) are not shown.

For each property being compared, the top bar is S21800 stainless steel and the bottom bar is C70250 copper.

UNS S21800 (Alloy 218) Stainless Steel UNS C70250 (CW112C) Nickel-Silicon Copper

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		190
Elastic (Young's, Tensile) Modulus, GPa		120

Poisson's Ratio		0.28
Poisson's Ratio		0.34

Shear Modulus, GPa		75
Shear Modulus, GPa		44

Tensile Strength: Ultimate (UTS), MPa		740
Tensile Strength: Ultimate (UTS), MPa		520 to 740

Thermal Properties

Latent Heat of Fusion, J/g		340
Latent Heat of Fusion, J/g		220

Maximum Temperature: Mechanical, °C		900
Maximum Temperature: Mechanical, °C		210

Melting Completion (Liquidus), °C		1360
Melting Completion (Liquidus), °C		1100

Melting Onset (Solidus), °C		1310
Melting Onset (Solidus), °C		1080

Specific Heat Capacity, J/kg-K		500
Specific Heat Capacity, J/kg-K		390

Thermal Expansion, µm/m-K		16
Thermal Expansion, µm/m-K		17

Otherwise Unclassified Properties

Base Metal Price, % relative		15
Base Metal Price, % relative		31

Density, g/cm³		7.5
Density, g/cm³		8.9

Embodied Carbon, kg CO₂/kg material		3.1
Embodied Carbon, kg CO₂/kg material		2.9

Embodied Energy, MJ/kg		45
Embodied Energy, MJ/kg		45

Embodied Water, L/kg		150
Embodied Water, L/kg		310

Common Calculations

Stiffness to Weight: Axial, points		14
Stiffness to Weight: Axial, points		7.4

Stiffness to Weight: Bending, points		26
Stiffness to Weight: Bending, points		18

Strength to Weight: Axial, points		27
Strength to Weight: Axial, points		16 to 23

Strength to Weight: Bending, points		24
Strength to Weight: Bending, points		16 to 21

Thermal Shock Resistance, points		17
Thermal Shock Resistance, points		18 to 26

Alloy Composition

Carbon (C), %		0 to 0.1
Carbon (C), %		0

Chromium (Cr), %		16 to 18
Chromium (Cr), %		0

Copper (Cu), %		0
Copper (Cu), %		92.7 to 97.5

Iron (Fe), %		59.1 to 65.4
Iron (Fe), %		0

Lead (Pb), %		0
Lead (Pb), %		0 to 0.050

Magnesium (Mg), %		0
Magnesium (Mg), %		0.050 to 0.3

Manganese (Mn), %		7.0 to 9.0
Manganese (Mn), %		0 to 0.1

Nickel (Ni), %		8.0 to 9.0
Nickel (Ni), %		2.2 to 4.2

Nitrogen (N), %		0.080 to 0.18
Nitrogen (N), %		0

Phosphorus (P), %		0 to 0.060
Phosphorus (P), %		0

Silicon (Si), %		3.5 to 4.5
Silicon (Si), %		0.25 to 1.2

Sulfur (S), %		0 to 0.030
Sulfur (S), %		0

Zinc (Zn), %		0
Zinc (Zn), %		0 to 1.0

Residuals, %		0
Residuals, %		0 to 0.5